/* ==================================================================
   WSDM Cup 2027 — Writing Agents for Community Notes
   ================================================================== */

:root {
  --paper: #faf8f4;
  --paper-2: #f2eee6;
  --card: #ffffff;
  --ink: #1c2130;
  --ink-2: #4a5060;
  --ink-3: #7a7f8c;
  --line: rgba(28, 33, 48, 0.12);
  --line-strong: rgba(28, 33, 48, 0.22);

  --ember: #b4521e;       /* AI-note orange from the proposal figure */
  --ember-soft: #f6e6db;
  --navy: #22365f;        /* human-note navy */
  --navy-soft: #e3e8f2;
  --ok: #2f7d5b;

  --serif: "Newsreader", Georgia, "Times New Roman", serif;
  --sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;

  --radius: 10px;
  --header-h: 64px;
  --maxw: 1180px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #13161d;
    --paper-2: #1a1e27;
    --card: #1d222c;
    --ink: #ecebe6;
    --ink-2: #b9bcc5;
    --ink-3: #8a8f9b;
    --line: rgba(236, 235, 230, 0.12);
    --line-strong: rgba(236, 235, 230, 0.24);
    --ember: #e57c44;
    --ember-soft: rgba(229, 124, 68, 0.14);
    --navy: #93a9d8;
    --navy-soft: rgba(147, 169, 216, 0.14);
    --ok: #5cc095;
  }
}
:root[data-theme="dark"] {
  --paper: #13161d;
  --paper-2: #1a1e27;
  --card: #1d222c;
  --ink: #ecebe6;
  --ink-2: #b9bcc5;
  --ink-3: #8a8f9b;
  --line: rgba(236, 235, 230, 0.12);
  --line-strong: rgba(236, 235, 230, 0.24);
  --ember: #e57c44;
  --ember-soft: rgba(229, 124, 68, 0.14);
  --navy: #93a9d8;
  --navy-soft: rgba(147, 169, 216, 0.14);
  --ok: #5cc095;
}

/* ---------- Base ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 24px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.65;
  overflow-x: clip;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--ember); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }

p { margin: 0 0 1rem; }
b, strong { font-weight: 600; }
abbr { text-decoration: underline dotted; cursor: help; }

:focus-visible { outline: 2px solid var(--ember); outline-offset: 3px; border-radius: 4px; }

.skip {
  position: absolute; left: 16px; top: -48px; z-index: 100;
  background: var(--ink); color: var(--paper); padding: 8px 14px; border-radius: 6px;
}
.skip:focus { top: 12px; }

/* Tiled "DRAFT" watermark behind the page. build.js adds .is-draft to <body> in the anonymized build. */
body.is-draft::before {
  content: ""; position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='420' height='420'%3E%3Ctext x='210' y='210' text-anchor='middle' dominant-baseline='central' transform='rotate(-30 210 210)' font-family='Menlo, Consolas, monospace' font-size='64' font-weight='600' letter-spacing='10' fill='%23808080'%3EDRAFT%3C/text%3E%3C/svg%3E") 0 0 / 420px 420px repeat;
  opacity: 0.13;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) body.is-draft::before { opacity: 0.17; }
}
:root[data-theme="dark"] body.is-draft::before { opacity: 0.17; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 12px 20px;
  background: var(--ember); color: #fff;
  border: 1px solid var(--ember); border-radius: 999px;
  font: 500 15px/1 var(--sans); text-decoration: none; white-space: nowrap;
  transition: transform 0.2s var(--ease), background 0.2s, box-shadow 0.2s;
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 6px 18px -8px var(--ember); }
.btn--ghost { background: transparent; color: var(--ink); border-color: var(--line-strong); }
.btn--ghost:hover { border-color: var(--ink); box-shadow: none; }
.btn--sm { padding: 8px 16px; font-size: 14px; }
.btn--disabled { background: var(--paper-2); border-color: var(--line); color: var(--ink-3); cursor: default; }
.btn--disabled:hover { transform: none; box-shadow: none; }

/* ---------- Top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: saturate(1.4) blur(12px);
  -webkit-backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}
.topbar.is-scrolled { border-bottom-color: var(--line); }
.topbar__inner {
  max-width: var(--maxw); margin: 0 auto; padding: 0 24px;
  height: var(--header-h);
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
}

.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; }
.brand__mark {
  width: 22px; height: 22px; border-radius: 6px;
  background:
    linear-gradient(135deg, var(--ember) 0 50%, transparent 50%),
    var(--navy);
}
.brand__text { font: 500 16px/1 var(--sans); letter-spacing: 0.01em; }
.brand__text b { color: var(--ember); font-weight: 600; }

/* The conference logo replaces the text brand. The text brand stays in the
   source so the anonymized build, which strips the logo, still has a header. */
.topbar:has(.conf-logo) .brand { display: none; }
.topbar:has(.conf-logo) .topnav { margin-right: auto; }

.conf-logo {
  display: inline-flex; align-items: center; flex: none;
  margin-left: 20px;
  color: var(--ink); text-decoration: none; line-height: 0;
}
.conf-logo:hover { opacity: 0.82; text-decoration: none; }
.conf-logo__svg { display: block; height: 46px; width: auto; }
.conf-logo__swoosh { fill: var(--ember); }
.conf-logo__type,
.conf-logo__year { fill: currentColor; }

.topnav { display: flex; align-items: center; gap: 26px; }
.topnav a:not(.btn) {
  color: var(--ink-2); text-decoration: none; font-size: 14.5px;
  transition: color 0.15s;
}
.topnav a:not(.btn):hover { color: var(--ink); }

.menu-toggle {
  display: none; width: 40px; height: 40px; border: 0; background: none; cursor: pointer;
  flex-direction: column; justify-content: center; align-items: center; gap: 6px;
}
.menu-toggle span { width: 20px; height: 1.5px; background: var(--ink); transition: transform 0.25s var(--ease); }
.menu-toggle[aria-expanded="true"] span:first-child { transform: translateY(3.75px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:last-child { transform: translateY(-3.75px) rotate(-45deg); }

.mobile-nav {
  display: grid; gap: 2px; padding: 8px 16px 16px;
  border-bottom: 1px solid var(--line); background: var(--paper);
}
.mobile-nav[hidden] { display: none; }
.mobile-nav a {
  padding: 12px 8px; color: var(--ink); text-decoration: none; font-size: 16px;
  border-bottom: 1px solid var(--line);
}
.mobile-nav a:last-child { border-bottom: 0; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  max-width: var(--maxw); margin: 0 auto;
  padding: 36px 24px 12px;
  display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 56px; align-items: center;
}
.hero::before {
  /* subtle dotted grid */
  content: ""; position: absolute; inset: 0 calc(50% - 50vw); z-index: -1;
  background-image: radial-gradient(var(--line) 1px, transparent 1px);
  background-size: 22px 22px;
  mask-image: linear-gradient(to bottom, #000 0%, transparent 85%);
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, transparent 85%);
}

.eyebrow {
  font: 500 12.5px/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--ember); margin-bottom: 22px;
}
.hero__title {
  font: 500 clamp(40px, 6.2vw, 72px)/1.02 var(--serif);
  letter-spacing: -0.02em; margin: 0 0 22px;
}
.hero__title em { font-style: italic; color: var(--navy); }
.hero__lede { font-size: 19px; color: var(--ink-2); max-width: 58ch; margin-bottom: 30px; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 44px; }

.facts {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 0; border-top: 1px solid var(--line-strong);
}
.facts__item { padding: 16px 16px 0 0; }
.facts__item + .facts__item { padding-left: 16px; border-left: 1px solid var(--line); }
.facts dt { font: 500 11.5px/1.2 var(--mono); text-transform: uppercase; letter-spacing: 0.07em; color: var(--ink-3); margin-bottom: 6px; }
.facts dd { margin: 0; font: 500 21px/1.2 var(--serif); }
.facts dd small { display: block; margin-top: 4px; font: 400 13px/1.35 var(--sans); color: var(--ink-3); }

/* Example post + Community Note */
.post {
  margin: 0; padding: 16px;
  background: var(--card); border: 1px solid var(--line); border-radius: 16px;
  box-shadow: 0 1px 0 var(--line), 0 24px 48px -28px rgba(28, 33, 48, 0.35);
  font-size: 14.5px; line-height: 1.45;
  transform: rotate(1.2deg);
  transition: transform 0.5s var(--ease);
}
.post:hover { transform: rotate(0deg) translateY(-2px); }
.post__head { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.post__avatar { width: 38px; height: 38px; border-radius: 50%; object-fit: cover; }
.post__who { display: flex; flex-direction: column; line-height: 1.2; }
.post__name { font-weight: 600; }
.post__handle { color: var(--ink-3); font-size: 13.5px; }
.post__text { margin: 0 0 10px; }
.post__media {
  display: block; width: 100%; aspect-ratio: 1520 / 998; object-fit: cover;
  border-radius: 12px; border: 1px solid var(--line);
}

.cnote {
  margin-top: 12px;
  border: 1px solid var(--line-strong); border-radius: 12px;
  overflow: hidden;
}
.cnote__head {
  display: flex; align-items: center; gap: 8px; padding: 9px 12px;
  background: color-mix(in srgb, var(--ink) 7%, var(--card));
  font-weight: 600; font-size: 13.5px;
}
.cnote__icon { width: 18px; height: 18px; fill: #1d9bf0; }
.cnote__body { margin: 0; padding: 10px 12px 12px; font-size: 12.5px; line-height: 1.4; color: var(--ink); }
.cnote__link { color: #1d9bf0; }

/* ---------- Layout ---------- */
.layout {
  max-width: var(--maxw); margin: 0 auto; padding: 0 24px 80px;
  display: grid; grid-template-columns: 200px minmax(0, 1fr); gap: 64px;
}

/* padding-top matches .section:first-child so the label lines up with the Overview heading */
.toc { position: sticky; top: calc(var(--header-h) + 32px); align-self: start; padding-top: 24px; }
.toc__label { font: 500 11.5px/1 var(--mono); text-transform: uppercase; letter-spacing: 0.08em; color: var(--ink-3); margin-bottom: 14px; }
.toc ol { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--line); }
.toc a {
  display: block; padding: 6px 0 6px 16px; margin-left: -1px;
  border-left: 2px solid transparent;
  color: var(--ink-3); text-decoration: none; font-size: 14.5px;
  transition: color 0.15s, border-color 0.15s;
}
.toc a:hover { color: var(--ink); }
.toc a.is-active { color: var(--ink); border-left-color: var(--ember); font-weight: 500; }

.content { min-width: 0; max-width: 760px; }

/* ---------- Sections ---------- */
.section { padding: 56px 0; border-top: 1px solid var(--line); }
.section:first-child { border-top: 0; padding-top: 24px; }

.section__title {
  display: flex; align-items: baseline; gap: 14px;
  font: 500 34px/1.15 var(--serif); letter-spacing: -0.015em; margin: 0 0 22px;
}
.section__num { font: 500 13px/1 var(--mono); color: var(--ember); letter-spacing: 0.04em; transform: translateY(-6px); }

.sub { font: 600 13px/1.3 var(--mono); text-transform: uppercase; letter-spacing: 0.07em; color: var(--ink-2); margin: 32px 0 14px; }
.section__title + .sub { margin-top: 0; }

.fine { font-size: 14px; color: var(--ink-3); margin-top: 14px; }

/* Overview */
.question {
  margin: 28px 0; padding: 4px 0 4px 24px;
  border-left: 3px solid var(--ember);
  font: italic 400 23px/1.45 var(--serif); color: var(--ink);
}

.stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; margin-top: 8px; }
.stat {
  padding: 20px; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  display: flex; flex-direction: column; gap: 6px;
}
.stat__num { font: 500 42px/1 var(--serif); color: var(--ember); letter-spacing: -0.02em; }
.stat--gap .stat__num { color: var(--navy); }
.stat__label { font-size: 14.5px; color: var(--ink-2); line-height: 1.45; }

/* Task pipeline */
.pipeline {
  list-style: none; margin: 26px 0; padding: 0;
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
  counter-reset: step; position: relative;
}
.pipeline li {
  counter-increment: step; position: relative;
  padding: 44px 18px 0 0; font-size: 14.5px; color: var(--ink-2); line-height: 1.5;
}
.pipeline li::before {
  content: counter(step);
  position: absolute; top: 0; left: 0; z-index: 1;
  width: 28px; height: 28px; border-radius: 50%;
  display: grid; place-items: center;
  background: var(--paper); border: 1.5px solid var(--ember); color: var(--ember);
  font: 500 13px/1 var(--mono);
}
.pipeline li::after {
  content: ""; position: absolute; top: 14px; left: 28px; right: 0; height: 1.5px;
  background: repeating-linear-gradient(90deg, var(--line-strong) 0 4px, transparent 4px 8px);
}
.pipeline li:last-child::after { display: none; }
.pipeline li:last-child::before { background: var(--ember); color: #fff; }
.pipeline__step { display: block; font: 600 15.5px/1.3 var(--sans); color: var(--ink); margin-bottom: 4px; }

.callout {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr));
  background: var(--navy-soft); border-radius: var(--radius); overflow: hidden;
}
.callout > div { padding: 18px 20px; font-size: 14.5px; color: var(--ink-2); line-height: 1.4; }
.callout > div + div { border-left: 1px solid var(--line); }
.callout strong { display: block; font: 500 28px/1.1 var(--serif); color: var(--navy); margin-bottom: 4px; }

/* Timeline */
.timeline { list-style: none; margin: 8px 0 0; padding: 0; position: relative; }
.timeline::before {
  content: ""; position: absolute; left: 131px; top: 8px; bottom: 8px; width: 1.5px; background: var(--line-strong);
}
.timeline li {
  position: relative; display: grid; grid-template-columns: 112px minmax(0, 1fr); gap: 40px;
  padding: 12px 0;
}
.timeline li::before {
  content: ""; position: absolute; left: 126px; top: 19px;
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--paper); border: 2px solid var(--ink-3);
}
.timeline time { font: 500 13.5px/1.5 var(--mono); color: var(--ink-3); padding-top: 2px; text-align: right; }
.timeline h3 { margin: 0; font: 500 17px/1.4 var(--sans); }
.timeline p { margin: 6px 0 0; font-size: 14.5px; color: var(--ink-2); }

.timeline li.is-phase::before { border-color: var(--navy); }
.timeline li.is-key::before { background: var(--ember); border-color: var(--ember); }
.timeline li.is-key time { color: var(--ember); }
.timeline li.is-past { opacity: 0.5; }
.timeline li.is-past::before { background: var(--ink-3); border-color: var(--ink-3); }
.timeline li.is-next h3::after {
  content: "Up next"; margin-left: 10px; vertical-align: 2px;
  font: 500 11px/1 var(--mono); text-transform: uppercase; letter-spacing: 0.06em;
  padding: 4px 8px; border-radius: 999px; background: var(--ember-soft); color: var(--ember);
}

/* Evaluation */
.metric {
  padding: 24px 26px; margin-bottom: 22px;
  background: var(--card); border: 1px solid var(--line); border-left: 3px solid var(--ember);
  border-radius: var(--radius);
}
.metric__label { font: 500 11.5px/1 var(--mono); text-transform: uppercase; letter-spacing: 0.08em; color: var(--ember); margin-bottom: 10px; }
.metric__value { font: 500 24px/1.35 var(--serif); margin: 0; }

.ranked { margin: 0; padding: 0; list-style: none; counter-reset: r; }
.ranked li {
  counter-increment: r; display: flex; gap: 14px; align-items: baseline;
  padding: 10px 0; border-bottom: 1px solid var(--line);
}
.ranked li::before { content: counter(r); font: 500 13px/1 var(--mono); color: var(--ember); min-width: 14px; }

/* Term with hover/focus definition */
.term {
  position: relative; display: inline-block; cursor: help;
  text-decoration: underline dotted var(--ember); text-decoration-thickness: 2px; text-underline-offset: 4px;
  background: var(--ember-soft); border-radius: 4px; padding: 0 4px;
}
.term__tip {
  position: absolute; left: 50%; bottom: 100%; z-index: 20;
  width: max-content; max-width: 280px; padding: 10px 12px; margin-bottom: 8px;
  background: var(--ink); color: var(--paper); border-radius: 8px;
  font: 400 13.5px/1.45 var(--sans); text-align: left; text-decoration: none;
  box-shadow: 0 10px 30px -12px rgba(0, 0, 0, 0.5);
  opacity: 0; visibility: hidden; transform: translate(-50%, 4px);
  transition: opacity 0.15s, transform 0.15s, visibility 0.15s;
}
.term__tip::before { content: ""; position: absolute; left: 0; right: 0; top: 100%; height: 12px; }
.term__tip::after {
  content: ""; position: absolute; left: 50%; top: 100%; transform: translateX(-50%);
  border: 6px solid transparent; border-top-color: var(--ink);
}
.term__tip b { font-weight: 600; }
.term__tip a { color: inherit; text-decoration: underline; }
.term:hover .term__tip,
.term:focus-within .term__tip { opacity: 1; visibility: visible; transform: translate(-50%, 0); }

/* Prizes */
.prizes { display: grid; grid-template-columns: 1.3fr 1fr 1fr; gap: 14px; align-items: end; }
.prizes + p { margin-top: 18px; }
.prize {
  display: flex; flex-direction: column; justify-content: space-between; gap: 22px;
  padding: 20px 22px; border-radius: var(--radius);
  background: var(--ember); border: 1px solid var(--ember); color: #fff;
}
.prize__place { font: 500 12px/1 var(--mono); text-transform: uppercase; letter-spacing: 0.08em; color: rgba(255, 255, 255, 0.8); }
.prize__amt { font: 500 36px/1 var(--serif); letter-spacing: -0.02em; }
.prize--1 { min-height: 168px; }
.prize--1 .prize__amt { font-size: 52px; }
.prize--2 { min-height: 138px; }
.prize--3 { min-height: 118px; }

.bonus { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.bonus__item {
  display: flex; flex-direction: column; gap: 6px; padding: 20px 22px;
  background: var(--navy); border: 1px solid var(--navy); border-radius: var(--radius);
  color: rgba(255, 255, 255, 0.82); font-size: 14.5px; line-height: 1.45;
}
.bonus__item b { color: #fff; }
.bonus__tag {
  font: 500 12px/1 var(--mono); text-transform: uppercase; letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.8); margin-bottom: 14px;
}
.bonus__amt { font: 500 36px/1 var(--serif); letter-spacing: -0.02em; color: #fff; margin-bottom: 8px; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .bonus__item { background: #22365f; border-color: #22365f; }
}
:root[data-theme="dark"] .bonus__item { background: #22365f; border-color: #22365f; }

.support { margin: 0; padding: 0; list-style: none; }
.support li { padding: 10px 0; border-bottom: 1px solid var(--line); color: var(--ink-2); }
.support b { color: var(--ink); font-family: var(--serif); font-size: 19px; font-weight: 500; margin-right: 6px; }

.checks { list-style: none; margin: 0; padding: 0; }
.checks li { position: relative; padding: 8px 0 8px 30px; color: var(--ink-2); }
.checks li::before {
  content: ""; position: absolute; left: 2px; top: 14px;
  width: 14px; height: 8px;
  border-left: 2px solid var(--ember); border-bottom: 2px solid var(--ember);
  transform: rotate(-45deg);
}

/* Participation */
.register-card {
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
  margin-top: 36px; padding: 26px 28px; border-radius: 14px;
  background: var(--navy-soft); border: 1px solid var(--line-strong);
}
.register-card h3 { margin: 0 0 6px; font: 500 24px/1.2 var(--serif); }
.register-card p { margin: 0; color: var(--ink-2); font-size: 15px; }
.register-card .btn { flex: none; }

.rules { margin-top: 28px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); }
.rules summary {
  cursor: pointer; list-style: none; padding: 16px 20px;
  display: flex; justify-content: space-between; align-items: center;
  font-weight: 500;
}
.rules summary::-webkit-details-marker { display: none; }
.rules summary::after { content: "+"; font: 400 22px/1 var(--sans); color: var(--ember); transition: transform 0.25s var(--ease); }
.rules[open] summary::after { transform: rotate(45deg); }
.rules__intro { margin: 0; padding: 4px 20px 12px; color: var(--ink-2); font-size: 15px; }
.rules ol { margin: 0; padding: 0 20px 16px 44px; color: var(--ink-2); font-size: 15px; }
.rules li { padding: 6px 0; }
.rules li b { color: var(--ink); }

/* Resources */
.links { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.link-card {
  position: relative; display: flex; flex-direction: column; gap: 4px;
  padding: 18px 18px 20px; border-radius: var(--radius);
  background: var(--card); border: 1px solid var(--line);
  color: var(--ink); text-decoration: none;
  transition: border-color 0.2s, transform 0.25s var(--ease);
}
.link-card::after {
  content: "↗"; position: absolute; top: 16px; right: 16px;
  color: var(--ink-3); transition: color 0.2s, transform 0.25s var(--ease);
}
.link-card:hover { border-color: var(--ember); transform: translateY(-2px); }
.link-card:hover::after { color: var(--ember); transform: translate(2px, -2px); }
.link-card__kind { font: 500 11px/1 var(--mono); text-transform: uppercase; letter-spacing: 0.08em; color: var(--ember); margin-bottom: 8px; }
.link-card__title { font: 500 17px/1.3 var(--sans); }
.link-card__desc { font-size: 14px; color: var(--ink-3); line-height: 1.45; }

/* Organizers */
.people { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.people > li { display: flex; }
.person {
  flex: 1; display: flex; flex-direction: column; align-items: center; text-align: center;
  padding: 22px 14px 18px; border-radius: var(--radius);
  background: var(--card); border: 1px solid var(--line);
  color: var(--ink); text-decoration: none;
  transition: border-color 0.2s, transform 0.25s var(--ease);
}
a.person:hover { border-color: var(--ember); transform: translateY(-2px); }
.person__avatar {
  width: 88px; height: 88px; border-radius: 50%; margin-bottom: 14px;
  object-fit: cover; object-position: center 25%;
  display: grid; place-items: center;
  background: var(--paper-2); border: 1px solid var(--line);
  font: 500 22px/1 var(--mono); color: var(--navy);
}
.person__name { font-weight: 500; line-height: 1.3; }
.person__org { font-size: 13.5px; color: var(--ink-3); line-height: 1.35; margin-top: 2px; }
a.person .person__name { text-decoration: underline; text-decoration-color: var(--line-strong); text-decoration-thickness: 1px; text-underline-offset: 3px; transition: text-decoration-color 0.2s; }
a.person:hover .person__name { color: var(--ember); text-decoration-color: var(--ember); }

/* Contact */
.contact { display: grid; gap: 12px; }
.contact__item {
  display: flex; justify-content: space-between; align-items: baseline; gap: 16px; flex-wrap: wrap;
  padding: 16px 20px; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--card); color: var(--ink); text-decoration: none;
  transition: border-color 0.2s;
}
.contact__item:hover { border-color: var(--ember); }
.contact__label { font-weight: 500; }
.contact__desc { font-size: 14px; color: var(--ink-3); }
.contact__note { font-size: 15px; color: var(--ink-2); margin: 6px 0 0; }

/* Footer */
.footer { border-top: 1px solid var(--line); }
.footer__inner {
  max-width: var(--maxw); margin: 0 auto; padding: 28px 24px;
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  font-size: 14px; color: var(--ink-3);
}
.footer a { color: var(--ink-2); text-decoration: none; }
.footer a:hover { color: var(--ember); }

/* ---------- Responsive ---------- */
@media (max-width: 1020px) {
  .hero { grid-template-columns: 1fr; gap: 40px; }
  .post { max-width: 380px; }
  .layout { grid-template-columns: 1fr; gap: 0; }
  .toc { display: none; }
  .content { max-width: none; }
}

@media (max-width: 820px) {
  .topnav { display: none; }
  .menu-toggle { display: inline-flex; }
  .conf-logo { margin-left: auto; }
  .pipeline { grid-template-columns: 1fr; gap: 0; }
  .pipeline li { padding: 0 0 22px 46px; }
  .pipeline li::after { top: 28px; bottom: 0; left: 14px; right: auto; width: 1.5px; height: auto;
    background: repeating-linear-gradient(180deg, var(--line-strong) 0 4px, transparent 4px 8px); }
  .links, .people { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  .topbar__inner, .hero, .layout, .footer__inner { padding-left: 16px; padding-right: 16px; }
  .hero { padding-top: 24px; padding-bottom: 0; }
  .hero__lede { font-size: 17.5px; }
  .facts { grid-template-columns: 1fr 1fr; }
  .facts__item:first-child { grid-column: 1 / -1; }
  .facts__item:nth-child(2) { padding-left: 0; border-left: 0; }
  .facts__item:nth-child(n + 2) { padding-top: 14px; }
  .post { transform: none; }
  .section { padding: 44px 0; }
  .section__title { font-size: 28px; }
  .question { font-size: 20px; padding-left: 18px; }
  .stats, .callout, .bonus, .links, .people { grid-template-columns: 1fr; }
  .callout > div + div { border-left: 0; border-top: 1px solid var(--line); }
  .prizes { grid-template-columns: 1fr 1fr; }
  .prize--1 { grid-column: 1 / -1; min-height: 0; }
  .prize--2, .prize--3 { min-height: 0; }
  .timeline::before { left: 5px; }
  .timeline li { grid-template-columns: 1fr; gap: 2px; padding-left: 28px; }
  .timeline li::before { left: 0; top: 16px; }
  .timeline time { text-align: left; }
  .register-card { flex-direction: column; align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}